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[23.128.96.18]) by mx.google.com with ESMTP id m6si4473084eda.215.2020.05.26.06.05.19; Tue, 26 May 2020 06:05:46 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-crypto-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b="dG6/9sBz"; spf=pass (google.com: domain of linux-crypto-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-crypto-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730436AbgEZM16 (ORCPT + 99 others); Tue, 26 May 2020 08:27:58 -0400 Received: from lelv0142.ext.ti.com ([198.47.23.249]:41572 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726437AbgEZM15 (ORCPT ); Tue, 26 May 2020 08:27:57 -0400 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 04QCRkag123725; Tue, 26 May 2020 07:27:46 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1590496066; bh=fW4dh2RlDLtgqAe1LMh/aOIhCZSLWJb/46PvuFUCsOU=; h=Subject:To:CC:References:From:Date:In-Reply-To; b=dG6/9sBzee8Qvx2us5nsIDzM8Bi2JHCw/+EF8HoWm+T2bSlzEIpZjAIFZY5LQxULl jPkETCCEdNotNdeYA1I4kZdVNITJr/rmcGH5fAF+ucRTQWFd/Zoey1b2BolmdxDows VtJvip4t9MyvsT5poABHgqPIHHAFhxOJlavlOG5E= Received: from DFLE114.ent.ti.com (dfle114.ent.ti.com [10.64.6.35]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 04QCRkFk047965 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 26 May 2020 07:27:46 -0500 Received: from DFLE110.ent.ti.com (10.64.6.31) by DFLE114.ent.ti.com (10.64.6.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Tue, 26 May 2020 07:27:46 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE110.ent.ti.com (10.64.6.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Tue, 26 May 2020 07:27:46 -0500 Received: from [127.0.0.1] (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 04QCRcHW085540; Tue, 26 May 2020 07:27:45 -0500 Subject: Re: [PATCHv2 3/7] crypto: omap-crypto: fix userspace copied buffer access To: Herbert Xu CC: , , , Tejun Heo References: <20200511111913.26541-1-t-kristo@ti.com> <20200511111913.26541-4-t-kristo@ti.com> <20200522131247.GA27255@gondor.apana.org.au> From: Tero Kristo Message-ID: <24092385-1348-f55d-a637-6fb2b3129f4e@ti.com> Date: Tue, 26 May 2020 15:27:38 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200522131247.GA27255@gondor.apana.org.au> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org On 22/05/2020 16:12, Herbert Xu wrote: > On Mon, May 11, 2020 at 02:19:09PM +0300, Tero Kristo wrote: >> In case buffers are copied from userspace, directly accessing the page >> will most likely fail because it hasn't been mapped into the kernel >> memory space. Fix the issue by forcing a kmap / kunmap within the >> cleanup functionality. >> >> Signed-off-by: Tero Kristo >> --- >> drivers/crypto/omap-crypto.c | 9 +++++++-- >> 1 file changed, 7 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/crypto/omap-crypto.c b/drivers/crypto/omap-crypto.c >> index cc88b7362bc2..31bdb1d76d11 100644 >> --- a/drivers/crypto/omap-crypto.c >> +++ b/drivers/crypto/omap-crypto.c >> @@ -178,11 +178,16 @@ static void omap_crypto_copy_data(struct scatterlist *src, >> amt = min(src->length - srco, dst->length - dsto); >> amt = min(len, amt); >> >> - srcb = sg_virt(src) + srco; >> - dstb = sg_virt(dst) + dsto; >> + srcb = kmap_atomic(sg_page(src)) + srco + src->offset; >> + dstb = kmap_atomic(sg_page(dst)) + dsto + dst->offset; >> >> memcpy(dstb, srcb, amt); >> >> + flush_dcache_page(sg_page(dst)); > > You need to check !PageSlab as it's illegal to call it on a kernel > page. Also you should be using flush_kernel_dcache_page. scatterwalk > uses flush_dcache_page only because when it was created the other > function didn't exist. Ok will fix that. > Would it be possible to use the sg_miter interface to do the copy? > In fact your function could possibly be added to lib/scatterlist.c > as it seems to be quite generic. I think it would make sense to use that, however as I am just fixing an existing bug here, would it be ok if I just fix your above comment and post v3? I can convert this later to sg_miter and take a shot at moving this to lib/scatterlist.c as that seems slightly bigger effort and I would not want to block this whole series because of that... -Tero -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki